Zuckerberg called Cook’s criticism “extremely glib”, and apparently he was seething behind closed doors. He was mad enough to tell his executives to use Android phones instead of Apple’s iPhone, according to a new report from The New York Times.

“Mr. Cook’s criticisms infuriated Mr. Zuckerberg, who later ordered his management team to use only Android phones, since the operating system has far more users than Apple’s,” states the report.

The zing earlier this year that might have upset Zuckerberg came during an interview on MSNBC.

Recode’s Kara Swisher asked Cook a question about Cambridge Analytica, an incident in which private Facebook user data was stolen from 50 million users, asking if the Apple CEO was in Zuckerberg’s place. “What would you do?” Swisher said.

Cook answered: “What would do? I wouldn’t be in this situation.”

In the same interview and in subsequent speeches, Cook called for privacy regulation that would impact businesses like Facebook, which make their money from ads, significantly more than Apple, which makes money from hardware sales.

But Cook and Zuckerberg have traded barbs for years. Cook said in an interview with Charlie Rose in 2014 that “When an online service is free, you’re not the customer. You’re the product.”

This apparently got under Zuckerberg’s skin even back then, with a journalist from Time noticing the tension in a profile of the Facebook founder:

“But before that happens Zuckerberg also notes – and it was the only time I saw him display irritation – that Apple CEO Tim Cook wrote something similar in September in a statement spelling out Apple’s privacy policy: “When an online service is free, you’re not the customer. You’re the product.” The shot was probably meant for Google, but Facebook was definitely in the blast radius.

“A frustration I have is that a lot of people increasingly seem to equate an advertising business model with somehow being out of alignment with your customers,” Zuckerberg says. “I think it’s the most ridiculous concept. What, you think because you’re paying Apple that you’re somehow in alignment with them? If you were in alignment with them, then they’d make their products a lot cheaper!”

Years later, it appears Zuckerberg still isn’t “in alignment” with Apple if he’s making his management team eschew a specific brand of phone.